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                                <h3 id="linux&#x4E0B;c&#x8BED;&#x8A00;&#x7B80;&#x5355;&#x5B9E;&#x73B0;cat&#x3001;ls&#x3001;cd&#x547D;&#x4EE4;">Linux&#x4E0B;C&#x8BED;&#x8A00;&#x7B80;&#x5355;&#x5B9E;&#x73B0;cat&#x3001;ls&#x3001;cd&#x547D;&#x4EE4;</h3>
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<pre><code class="lang-c"><span class="hljs-comment">//mycat.c</span>
<span class="hljs-meta">#<span class="hljs-meta-keyword">include</span> <span class="hljs-meta-string">&lt;stdio.h&gt;</span></span>
<span class="hljs-function"><span class="hljs-keyword">int</span> <span class="hljs-title">main</span><span class="hljs-params">(<span class="hljs-keyword">int</span> argc, <span class="hljs-keyword">char</span> *argv[])</span>
</span>{
    FILE *fp = fopen(argv[<span class="hljs-number">1</span>], <span class="hljs-string">&quot;r&quot;</span>);   <span class="hljs-comment">// &#x4EE5;&#x53EA;&#x8BFB;&#x65B9;&#x5F0F;&#x6253;&#x5F00;&#x6587;&#x4EF6;&#xFF0C;argv[1]&#x662F;&#x8F93;&#x5165;&#x7684;&#x8981;&#x663E;&#x793A;&#x7684;&#x6587;&#x4EF6;&#x8DEF;&#x5F84;&#x540D;</span>
    <span class="hljs-keyword">int</span> read_ret;
    <span class="hljs-keyword">if</span>(argc &lt; <span class="hljs-number">2</span>)  <span class="hljs-comment">//&#x8BF4;&#x660E;&#x6CA1;&#x6709;&#x8F93;&#x5165;&#x8981;&#x663E;&#x793A;&#x7684;&#x6587;&#x4EF6;&#x540D;&#xFF0C;&#x53EA;&#x6709;&#x672C;&#x7A0B;&#x5E8F;&#x540D;argv[0]</span>
    {
        <span class="hljs-built_in">printf</span>(<span class="hljs-string">&quot;please input source file!\n&quot;</span>);
    }
    <span class="hljs-keyword">if</span>(fp == <span class="hljs-literal">NULL</span>)  <span class="hljs-comment">//&#x5982;&#x679C;&#x6253;&#x5F00;&#x6210;&#x529F;&#x7684;&#x8BDD;&#x5C31;&#x628A;&#x8BE5;&#x6587;&#x4EF6;&#x7684;&#x4FE1;&#x606F;&#x7ED3;&#x6784;&#x4F53;&#x5730;&#x5740;&#x8D4B;&#x7ED9;&#x6587;&#x4EF6;&#x6307;&#x9488;fp&#xFF0C;&#x5982;&#x679C;&#x6253;&#x5F00;&#x4E0D;&#x6210;&#x529F;&#x7684;&#x8BDD;&#x5C31;&#x5C06;&#x6587;&#x4EF6;&#x6307;&#x9488;fp&#x7F6E;&#x4E3A;&#x65E0;&#x6548;(NULL)</span>
    {
        <span class="hljs-built_in">printf</span>(<span class="hljs-string">&quot;open source %s failed!\n&quot;</span>, argv[<span class="hljs-number">1</span>]);
        <span class="hljs-keyword">return</span> <span class="hljs-number">-1</span>;
    }
    <span class="hljs-keyword">while</span>(<span class="hljs-number">1</span>)  <span class="hljs-comment">//&#x6210;&#x529F;&#x6253;&#x5F00;</span>
    {
        read_ret = fgetc(fp);  <span class="hljs-comment">//&#x5355;&#x4E2A;&#x5B57;&#x7B26;&#x8BFB;&#x5199;</span>
        <span class="hljs-keyword">if</span>(feof(fp))  <span class="hljs-comment">// feof&#x5224;&#x65AD;&#x6587;&#x4EF6;&#x7ED3;&#x675F;&#xFF0C;&#x82E5;fp&#x5DF2;&#x7ECF;&#x6307;&#x5411;&#x6587;&#x4EF6;&#x672B;&#x5C3E;&#xFF0C;&#x5219;feof&#xFF08;fp&#xFF09;&#x51FD;&#x6570;&#x503C;&#x4E3A;&#x201C;&#x771F;&#x201D;&#xFF0C;&#x5373;&#x8FD4;&#x56DE;&#x975E;&#x96F6;&#x503C;</span>
        {
            <span class="hljs-built_in">printf</span>(<span class="hljs-string">&quot;read file %s endl\n&quot;</span>,argv[<span class="hljs-number">1</span>]);   <span class="hljs-comment">//&#x63D0;&#x793A;&#x8BFB;&#x5199;&#x7ED3;&#x675F;       </span>
            <span class="hljs-keyword">break</span>;
        }
        fputc(read_ret,<span class="hljs-built_in">stdout</span>);  <span class="hljs-comment">//&#x628A;&#x5355;&#x4E2A;&#x5B57;&#x7B26;&#x8F93;&#x51FA;&#x5230;&#x5C4F;&#x5E55;</span>
    }
}
</code></pre>
<h4 id="ls&#x547D;&#x4EE4;&#x7684;&#x7B80;&#x5355;&#x5B9E;&#x73B0;">ls&#x547D;&#x4EE4;&#x7684;&#x7B80;&#x5355;&#x5B9E;&#x73B0;</h4>
<pre><code class="lang-c"><span class="hljs-comment">//myls.c </span>
<span class="hljs-meta">#<span class="hljs-meta-keyword">include</span> <span class="hljs-meta-string">&lt;stdio.h&gt;</span></span>
 <span class="hljs-meta">#<span class="hljs-meta-keyword">include</span> <span class="hljs-meta-string">&lt;sys/types.h&gt;</span></span>
 <span class="hljs-meta">#<span class="hljs-meta-keyword">include</span> <span class="hljs-meta-string">&lt;dirent.h&gt;</span></span>

 <span class="hljs-function"><span class="hljs-keyword">int</span> <span class="hljs-title">main</span><span class="hljs-params">(<span class="hljs-keyword">int</span> argc, <span class="hljs-keyword">char</span>* argv[])</span>
 </span>{    
     DIR *dp=<span class="hljs-literal">NULL</span>;
     <span class="hljs-keyword">struct</span> dirent * dt=<span class="hljs-literal">NULL</span>;
     dp=opendir(<span class="hljs-string">&quot;./&quot;</span>);
     <span class="hljs-keyword">if</span>(dp==<span class="hljs-literal">NULL</span>)
     {
         perror(<span class="hljs-string">&quot;opendir err&quot;</span>);
         <span class="hljs-keyword">return</span> <span class="hljs-number">-1</span>;
     }

     <span class="hljs-keyword">while</span>(<span class="hljs-number">1</span>)
     {
         dt = readdir(dp);
         <span class="hljs-keyword">if</span>(dt==<span class="hljs-literal">NULL</span>)
         {
             <span class="hljs-keyword">break</span>;
         }
         <span class="hljs-keyword">if</span>(dt-&gt;d_name[<span class="hljs-number">0</span>] != <span class="hljs-string">&apos;.&apos;</span>)
             <span class="hljs-built_in">printf</span>(<span class="hljs-string">&quot;%s\n&quot;</span>, dt-&gt;d_name);
     }

     closedir(dp);

     <span class="hljs-keyword">return</span> <span class="hljs-number">0</span>;
 }
</code></pre>
<h4 id="cd&#x547D;&#x4EE4;&#x7684;&#x7B80;&#x5355;&#x5B9E;&#x73B0;">cd&#x547D;&#x4EE4;&#x7684;&#x7B80;&#x5355;&#x5B9E;&#x73B0;</h4>
<pre><code class="lang-c"><span class="hljs-comment">//mycd.c</span>
<span class="hljs-meta">#<span class="hljs-meta-keyword">include</span> <span class="hljs-meta-string">&lt;stdio.h&gt;</span></span>
<span class="hljs-meta">#<span class="hljs-meta-keyword">include</span> <span class="hljs-meta-string">&lt;unistd.h&gt;</span></span>
<span class="hljs-function"><span class="hljs-keyword">int</span> <span class="hljs-title">main</span><span class="hljs-params">()</span><span class="hljs-comment">//&#x6B63;&#x786E;&#x7684;</span>
</span>{
         <span class="hljs-keyword">char</span> s[]=<span class="hljs-string">&quot;test&quot;</span>;<span class="hljs-comment">//&#x5F53;&#x524D;&#x76EE;&#x5F55;&#x4E0B;&#x9762;&#x6709;&#x540D;&#x4E3A;test&#x7684;&#x6587;&#x4EF6;&#x5939;</span>
         chdir (s);
         <span class="hljs-keyword">char</span> xxx[<span class="hljs-number">1024</span>];<span class="hljs-comment">//&#x83B7;&#x53D6;&#x5F53;&#x524D;&#x76EE;&#x5F55;&#x5E76;&#x6253;&#x5370;</span>
         getcwd(xxx,<span class="hljs-number">1024</span>);
         <span class="hljs-built_in">printf</span>(<span class="hljs-string">&quot;The current directory is : %s\n&quot;</span>,xxx);
}
</code></pre>
<h5 id="chdir&#x51FD;&#x6570;&#x2014;&#x2014;change-working-directory">chdir&#x51FD;&#x6570;&#x2014;&#x2014;change working directory</h5>
<pre><code class="lang-c"><span class="hljs-meta">#<span class="hljs-meta-keyword">include</span> <span class="hljs-meta-string">&lt;unistd.h&gt;</span></span>
<span class="hljs-function"><span class="hljs-keyword">int</span> <span class="hljs-title">chdir</span><span class="hljs-params">(<span class="hljs-keyword">const</span> <span class="hljs-keyword">char</span> *path)</span></span>;
</code></pre>
<p>&#x9700;&#x8981;&#x6CE8;&#x610F;&#x7684;&#x662F;&#xFF0C;chdir&#x5E76;&#x4E0D;&#x662F;&#x76F4;&#x63A5;&#x628A;&#x7EC8;&#x7AEF;&#x5F53;&#x524D;&#x7684;&#x76EE;&#x5F55;&#x5207;&#x6362;&#xFF0C;&#x800C;&#x662F;&#x5728;&#x7F16;&#x5199;&#x7684;&#x7A0B;&#x5E8F;(mycd.c)&#x8FDB;&#x7A0B;&#x4E2D;&#x5207;&#x6362;&#x5F53;&#x524D;&#x5DE5;&#x4F5C;&#x76EE;&#x5F55;</p>
<p>&#x5173;&#x4E8E;chdir&#x66F4;&#x8BE6;&#x7EC6;&#x7684;&#x4FE1;&#x606F;&#x53EF;&#x5728;Linux&#x7CFB;&#x7EDF;&#x7EC8;&#x7AEF;&#x8F93;&#x5165;&#x547D;&#x4EE4;<code>man chdir</code>&#x67E5;&#x770B;</p>
<h3 id="make&#x5DE5;&#x5177;&#x7684;&#x7B80;&#x5355;&#x4F7F;&#x7528;">make&#x5DE5;&#x5177;&#x7684;&#x7B80;&#x5355;&#x4F7F;&#x7528;</h3>
<p>&#x7F16;&#x5199;makefile&#x6587;&#x4EF6;&#xFF0C;&#x4EE5;&#x521A;&#x624D;&#x7F16;&#x5199;&#x7684;mycd.c&#x4E3A;&#x4F8B;</p>
<pre><code class="lang-makefile"><span class="hljs-comment">#makefile</span>
mycd: mycd.o
        gcc -o mycd mycd.o
<span class="hljs-section">clean:</span>
        rm -f *.o
</code></pre>
<p>&#x6267;&#x884C;make&#x547D;&#x4EE4;</p>
<p><img src="http://q2cgswswp.bkt.clouddn.com/blog/imgs/20191212131441.png" alt="&#x6267;&#x884C;make&#x547D;&#x4EE4;"></p>
<p>&#x751F;&#x6210;&#x4E86;mycd.o&#x6587;&#x4EF6;&#x4EE5;&#x53CA;&#x53EF;&#x6267;&#x884C;&#x6587;&#x4EF6;mycd</p>
<p>&#x6267;&#x884C;make clean&#x53EF;&#x4EE5;&#x5220;&#x9664;mycd.o&#x6587;&#x4EF6;</p>
<p><img src="http://q2cgswswp.bkt.clouddn.com/blog/imgs/20191212131633.png" alt="make_clean&#x547D;&#x4EE4;"></p>
<p>&#x6D4B;&#x8BD5;&#x53EF;&#x6267;&#x884C;&#x6587;&#x4EF6;</p>
<p><img src="http://q2cgswswp.bkt.clouddn.com/blog/imgs/20191212132351.png" alt="&#x6D4B;&#x8BD5;&#x53EF;&#x6267;&#x884C;&#x6587;&#x4EF6;"></p>
<p>&#x6CE8;&#x610F;&#xFF1A;&#x7EC8;&#x7AEF;&#x8FD9;&#x91CC;&#x7684;&#x8DEF;&#x5F84;&#x662F;&#x4E0D;&#x4F1A;&#x53D8;&#x7684;&#xFF0C;&#x4E0D;&#x662F;&#x7A0B;&#x5E8F;&#x5199;&#x9519;&#x4E86;&#x54E6;&#xFF01;</p>

                                
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